2 Commits

Author	SHA1	Message	Date
Nigel Tao	947a3ddf87	cmd/gc: recognize u<<1 op u>>31 as a rotate when op is ^, not just |. ... R=rsc CC=golang-dev https://golang.org/cl/6249071	2012-06-04 20:53:32 +10:00
Russ Cox	c6ce44822c	cmd/gc: faster code, mainly for rotate ... * Eliminate bounds check on known small shifts. * Rewrite x<<s | x>>(32-s) as a rotate (constant s). * More aggressive (but still minimal) range analysis. R=ken, dave, iant CC=golang-dev https://golang.org/cl/6209077	2012-05-24 17:20:07 -04:00